count occurrences of string in acell of cells array (How many times a string appear) /*naive baies algorthim -cs*/

 i have given alarge single cell name Vocabulary.
Vocabulary = {'aaa','acc','champion'...,'zzz'} //all the words existing in all documents below without repitions
i also have given  acell of cells array named alldocuments
alldocuments={{37*1 cell} ,{128*1 cell}...}
each cell includes words  and category /* there are 3 categories sports ,science ,politics */
 for example :
sports=alldoucments{1} 'aaa' , 'c','zzz','a','c','aaa'...  /* 37 *1 cell/*
science=alldoucments {2} ='aaa' ,'q' ... /* 128*1 cell */
sports=alldocuments{3}= 'champoin', 'first'...

my main goal is to count for each word in vocabulary the number of occurrences according to the categories. for example { sports = 'aaa'=100 'acc'=0 'champion'=1000 ... scince ='aaa'=2 'acc'=5 champion=320... and so on for politics if anyone can help me he will save my week not only my day!!:) Your suggestion and ideas are highly appreciated. Thanx in advance